I may very well turn out to be wrong, but I think the emails are more likely than not all real. But even if they all turn out to be completely doctored, there's a much more responsible way of handling the information. Of course it'd be absurd to assume the emails are real, but it's almost as absurd to assume they can't be real and that to even attempt to objectively assess the claim is falling for propaganda.
This is a true Shiri's scissor, here. The left-leaning journalists who recognize, in my opinion, how ridiculous this behavior is vs. the rest are basically living on different planets.
Imagine multiple media outlets simultaneously get an email saying "Meowface denies being Dogface during the night". If someone refuses to print this, due lack of evidence and lack of truth - that is not called a cover-up. There is no reason to dignify it with airtime in the first place.
After all one can publish this sort of stuff on blogs, internet forums, tabloids etc. Curation is the true news product - sifting of truth from untruth is one way to do it.